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Home Courses Pre-University Calculus Course materials Lectures 2.2 Trigonometric functions

2.2 Trigonometric functions

Course week(s) Week 2
Course subject(s) 2. Functions (Part 2)

What is a trigonometric function? The trigonometric functions are usually defined as the ratio of two sides in a rectangular triangle. Alternatively you can define the sine, cosine and tangent using the unit circle. Watch the video to see how.

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What are the rules of calculation for trigonometric functions? Using the Pythagorean Theorem many rules can be derived. Others are more easily interpreted by considering the graph of the trigonometric functions, or by considering their definition in the unit circle. The most important trigonometric formulas are explained in this video!

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Catch the error

In the following video the angles are calculated using degrees. This is not the error you should catch.

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Pre-University Calculus by TU Delft OpenCourseWare is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
Based on a work at https://ocw.tudelft.nl/courses/pre-university-calculus/.
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